Lulu requires 300 DPI but when I try to upload pictures I get a message that says
The following files are too large: 0815 NEW edit.JPG
Maximum file size is 10240 kb.
How do I comply with Lulu's requirement?
Even minimum jpg compression drastically reduces actual file size.
A 50mb 5,400 x 3,600 pixel 300dpi when 'closed' is only 7.7mb, for example. And as you can see that's a far larger image than you need for even the largest book on Lulu. An A5 at 600 dpi is around 3.5mb.